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参数资料
| 型号： | BR25L020FV-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM SER 2KB SPI BUS 8SSOP |
| 标准包装： | 2,500 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 2K (256 x 8) |
| 速度： | 5MHz |
| 接口： | SPI 3 线串行 |
| 电源电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SSOP 1 型（0.173"，4.4mm 宽） |
| 供应商设备封装： | SSOP-8B |
| 包装： | 带卷 (TR) |
BR25L010-W, BR25L020-W, BR25L040-W, BR25L080-W, BR25L160-W, BR25L320-W, BR25L640-W
Technical Note
High speed operation
In order to realize stable high speed operations, pay attention to the following input / output pin conditions.
Input pin pull up, pull down resistance
When to attach pull up, pull down resistance to EEPROM input pin, select an appropriate value for the microcontroller
VOL, IOL from VIL characteristics of this IC.
Pull up resistance
R PU ≥
V CC - V OLM
I OLM
Microcontroller
I OHM
EEPROM
V OLM ≤
V ILE
V OLM
"L" output
V ILE
"L" input
Example) When Vcc = 5V, V ILM = 1.5V, V OLM = 0.4V, I OLM = 2mA,
from the equation ,
Fig.53 Pull up resistance
R PU ≥
R PU ≥
5-0.4
2 X 10 -3
2.3[kΩ]
With the value of Rpu to satisfy the above equation, V OLM
becomes 0.4V or higher, and with V ILE (= 1.5V), the equation
is also satisfied.
And, in order to prevent malfunction, mistake write at power ON/OFF, be sure to make CS pull up.
Pull down resistance
V OHM
EEPROM
V IHE
R PD ≥
V OHM ≥
V OHM
I OHM
V IHE
I OHM
Example) When Vcc = 5V, V OHM = Vcc - 0.5V, I OHM = 0.4mA,
V IHM = Vcc X 0.7V, from the equation ,
Fig.54 Pull down resistance
R PD ≥
R PD ≥
5-0.5
0.4 X 10 -3
11.3[kΩ]
Further, by amplitude VIHE, VILE of signal input to EEPROM, operation speed changes. By inputting signal of amplitude of
VCC / GND level to input, more stable high speed operations can be realized. On the contrary, when amplitude of 0.8VCC /
0.2VCC is input, operation speed becomes slow.
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
12/16
2010.07 - Rev. B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| BR25L020F-W | 制造商:ROHM 制造商全称:Rohm 功能描述:SPI BUS 2Kbit (256 x 8bit) EEPROM |
| BR25L020FWE2 | 制造商:ROHM Semiconductor 功能描述:EEPROM,SPI BUS,2kb,x8,SOP8 |
| BR25L020F-WE2 | 功能描述:电可擦除可编程只读存储器 SPI 2K BIT RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| BR25L020-W | 制造商:ROHM 制造商全称:Rohm 功能描述:SPI BUS Serial EEPROMs |
| BR25L040FJ-W | 制造商:ROHM 制造商全称:Rohm 功能描述:SPI BUS 4Kbit (512 x 8bit) EEPROM |
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